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Educational Codeforces Round 167 (Rated for Div. 2)
29:44:03
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Difficulty:
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dp
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
#
Name
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1399
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x814
1647F
Madoka and Laziness
dp
,
greedy
3100
x379
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2324
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3606
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1719
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1534
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2875
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x2006
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3053
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2267
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x717
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x983
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3997
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x628
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1736
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x867
1620F
Bipartite Array
dp
,
greedy
2800
x593
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x843
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x809
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x270
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4770
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x772
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2215
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3702
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x578
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2419
1610D
Not Quite Lee
combinatorics
,
dp
,
math
,
number theory
2000
x2629
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1890
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x527
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x523
1606E
Arena
combinatorics
,
dp
,
math
2100
x3409
1605F
PalindORme
combinatorics
,
dp
2900
x294
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x269
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x408
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x624
1603C
Extreme Extension
dp
,
greedy
,
math
,
number theory
2300
x1994
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x467
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1407
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1948
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1335
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2259
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1458
1593G
Changing Brackets
constructive algorithms
,
data structures
,
dp
,
greedy
2200
x1646
1593F
Red-Black Number
dfs and similar
,
dp
,
implementation
,
math
,
meet-in-the-middle
2100
x2377
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x173
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1169
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x891
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1744
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3630
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x780
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x992
1579G
Minimal Coverage
dp
2200
x2294
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1301
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x590
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x596
1572E
Polygon
binary search
,
dp
,
geometry
3000
x281
1572C
Paint
dp
,
greedy
2700
x1410
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x74
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x180
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x232
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x127
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x935
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4052
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1346
1560F2
Nearest Beautiful Number (hard version)
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
2100
x4248
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2237
1557D
Ezzat and Grid
data structures
,
dp
,
greedy
2200
x2491
1556F
Sports Betting
bitmasks
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
2500
x1192
1556E
Equilibrium
data structures
,
dp
,
greedy
2200
x2526
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1191
1553I
Stairs
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x198
1552F
Telepanting
binary search
,
data structures
,
dp
,
sortings
2200
x2823
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1776
1551E
Fixed Points
binary search
,
brute force
,
dp
2000
x3753
1550F
Jumping Around
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
graphs
,
shortest paths
2700
x641
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1464
1548C
The Three Little Pigs
combinatorics
,
dp
,
fft
,
math
2500
x1767
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2905
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x106
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x81
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x75
1542E2
Abnormal Permutation Pairs (hard version)
combinatorics
,
dp
,
fft
,
math
2700
x819
1542E1
Abnormal Permutation Pairs (easy version)
combinatorics
,
dp
,
fft
,
math
2400
x1201
1542D
Priority Queue
combinatorics
,
dp
,
implementation
,
math
,
ternary search
2200
x2551
1540C2
Converging Array (Hard Version)
dp
,
math
2900
x442
1540C1
Converging Array (Easy Version)
dp
,
math
2700
x604
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2512
1539E
Game with Cards
binary search
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
2500
x931
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2657
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x145
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x541
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x526
1530H
Turing's Award
data structures
,
dp
3400
x147
1530F
Bingo
bitmasks
,
combinatorics
,
dp
,
math
,
probabilities
2600
x755
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x514
1527E
Partition Game
binary search
,
data structures
,
divide and conquer
,
dp
2500
x2123
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x320
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x2003
1523H
Hopping Around the Array
data structures
,
dp
3500
x236
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